Connection Of The Brake Unit (Fr-Bu/Mt-Bu5) - Mitsubishi Electric FR-F720-00046 Instruction Manual

Connection of stand-alone option units
2.4.2

Connection of the brake unit (FR-BU/MT-BU5)

When connecting the brake unit (FR-BU(H)/MT-BU5) to improve the brake capability at deceleration, make connection
as shown below.
(1) Connection with the FR-BU (FR-F720-02330 (FR-F740-01160) or less)
Three-phase AC
power supply
*1 Connect the inverter terminals (P/+, N/-) and brake unit (FR-BU (H)) terminals so that their terminal signals match
with each other. (Incorrect connection will damage the inverter.)
*2 When the power supply is 400V class, install a step-down transformer.
*3 The wiring distance between the inverter, brake unit (FR-BU) and resistor unit (FR-BR) should be within 5m(16.4
feet). If twisted wires are used, the distance should be within 10m(32.8feet).
CAUTION
⋅ If the transistors in the brake unit should become faulty, the resistor can be unusually hot, causing a fire. Therefore, install a
magnetic contactor on the inverter's input side to configure a circuit so that a current is shut off in case of fault.
⋅ Do not remove a jumper across terminal P/+ and P1 except when connecting a DC reactor.
38
MCCB
T
*2
MC
Motor
R/L1 U
S/L2 V
IM
T/L3 W
Inverter
*1
N/−
*3
5m (16.4feet)
or less
ON OFF
MC
FR-BR
TH1
P
PR
TH2
FR-BU
PR
HA
P/+
HB
N/− HC